Flask



FIG. 1 is a front isometric view of the flask;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions of the flask depicted in broken dash lines represent thebounds of the claim and form no part of the claimed design.

CLAIM The ornamental design for a flask, as shown and described.